Just a thought.

If I have mentioned this point before, you can either forgive me or accept this point as a sort of " how has it panned out". Anyway, a while back I tried an experiment, I moved the interior mirror 90 degrees so that all I could see was the mirror edge on. This opened up a better view  of the frontal aspect and removed a tiresome blind spot that needed me to bend my head downwards and to the right when driving through certain "hazards" to the left. Obviously this meant no central mirror but I quickly learnt to rely on the door mirrors. Anyway, last week I put the mirror back to it's central position to check the difference and to prove to myself that for me at least the idea was beneficial. Within a couple of days I was satisfied that I liked the absence of the mirror and will look into removing it entirely. I will look into the legalities of doing this of course but I doubt that it will contravene construction and use. 
Anyway ,if you suffer with an interior mirror that gets in your view re: just to your left and maybe up a bit, then moving the mirror sideways on may be an answer. It works for me and it might for you plus it's a very cheap mod!

Roger 

A vehicle after 2010 has to have two external mirrors and an internal mirror, unless the internal mirror does not provide an adequate view to the rear, see

www.gov.uk/government/publications/mirro...rs-on-motor-vehicles

For example if you have a solid partition, a solid rear window or were towing something that obscures the rear view.

Thanks for the info. Doc. I suppose I could cover over the rear window but that would create problems of general vision so I guess the mirror stays sideways on. The door mirrors are a decent size so rear vision is OK.

Roger